Monticello is a town in Lafayette County, Wisconsin, United States.

According to the United States Census Bureau, the town has a total area of 19.7 square miles (50.9 km2), all of it recorded as land.

There were 52 housing units at an average density of 2.6 per square mile (1.0/km2).

17.6% of all households were made up of individuals, and 9.8% had someone living alone who was 65 years of age or older.

There were 14.0% of families and 22.0% of the population living below the poverty line, including 28.9% of under eighteens and 12.5% of those over 64.